Those who have not opened a box may reasonably be sceptical about the contents. Some will blindly, and unreasonably, insist that there's nothing inside. If, however, you've opened the box and seen what's inside, it may not be something that you feel any need to argue about.

I claim to have experienced a very detailed precognitive dream. Some will claim that I'm talking nonsense. Others, of a respectably scientific mind, will be sceptical.

As far as I know, there is no reliable experimental support for such phenomena.
"Time is what prevents everything from happening at once" - John Wheeler